Which case addressed the issue of segregation in public facilities as constitutional?

The case that addressed the issue of segregation in public facilities as constitutional is Plessy vs. Ferguson. This landmark decision, decided by the U.S. Supreme Court in 1896, upheld the constitutionality of racial segregation laws for public facilities under the doctrine of "separate but equal." The Court ruled that as long as the separate facilities for the races were equal, segregation did not violate the Equal Protection Clause of the Fourteenth Amendment. This ruling provided legal justification for the widespread practice of segregation in the United States, leading to an era where racially separate facilities were commonplace until it was eventually overturned by future cases, including Brown vs. Board of Education in 1954.

In contrast, Gideon vs. Wainwright focused on the right to counsel in criminal cases, Dred Scott vs. Sanford dealt with the status of enslaved people and their descendants in relation to citizenship, and Miranda vs. Arizona established the requirement for police to inform suspects of their rights during the interrogation process. Each of these cases addresses different constitutional issues not directly related to the legality of segregation in public facilities.